用于低能RHIC电子冷却器SRF升压腔的高阶模阻尼器
Higher order mode damper for low energy RHIC electron cooler SRF booster cavity
摘要：
为了提高RHIC在10 GeV/核子以下重离子束流的亮度，低能RHIC电子冷却器（LEReC）目前正在BNL调试。LEReC的直线加速器设计用于提供1.6 MeV至2.6 MeV的电子束，均方根dp/p小于5e-4。该直线加速器采用704 MHz超导射频（SRF）加速腔，加速电压高达2.2 MeV。在这种低能量和非常苛刻的能量扩展要求下，腔中高阶模（HOM）的控制变得至关重要，需要仔细评估以确保对光束的影响最小。在本文中，我们报告的HOM阻尼器的多物理设计，以满足该腔体的能量传播的要求，以及实验结果的HOM阻尼器的腔体和没有。
英文摘要：
To improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon, the Low Energy RHIC electron Cooler (LEReC) is currently under commissioning at BNL. The Linac of LEReC is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with rms dp/p less than 5e-4. A 704 MHz superconducting radio frequency (SRF) booster cavity in this Linac provides up to 2.2 MeV accelerating voltage. With such a low energy and very demanding energy spread requirement, control of Higher Order Modes (HOMs) in the cavities becomes critical and needs to be carefully evaluated to ensure minimum impact on the beam. In this paper, we report the multiphysics design of the HOM damper for this cavity to meet the energy spread requirement, as well as experimental results of the cavity with and without the HOM damper.
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